gcc -g example-10-1.cc -I /opt/opencv/include/opencv4 -L /opt/opencv/lib -lstdc++ -lopencv_imgcodecs -lopencv_highgui \
-lopencv_core -lopencv_imgproc -lopencv_videoio -lopencv_video -o example-10-1
./example-10-1 ../data/input/faceScene.jpg
